Intelligent socket with zero-cross detection protection

Abstract

The invention discloses an intelligent socket with zero-cross detection protection, which comprises a control circuit board. The control circuit board comprises a relay, a timer, a detection module, a power supply module and an MCU, the MCU is electrically connected with the detection module, the power supply module, the timer and the relay, the relay comprises a relay and a relay switch, the socket main body is electrically connected with the relay, the household electrical appliance is electrically connected with the socket main body, and the timer is electrically connected with the relay. The intelligent socket is reasonable in design and ingenious in conception, what can be guaranteed is that the relay contacts are closed when alternating current crosses the zero point, the voltage is greatly reduced when the contacts are closed, and the sparking phenomenon can be greatly reduced; when the contact is disconnected, the contact is just at the zero cross point of the load current, so that the generated reverse electromotive force is minimum, arc discharge can be reduced, the long-life design of the intelligent socket can be realized, the reliability of the intelligent socket is improved, and the service life of the intelligent socket is prolonged.

Description

technical field [0001] The invention relates to the technical field of smart sockets, in particular to a smart socket with zero-crossing detection protection. Background technique [0002] Smart socket is an important part of smart home, but the lack of key components has a short life span and is prone to damage and failure. Among them, the failure of relay contacts is an important reason; the reason is that when the contacts are closed or disconnected, Instantaneous arc discharge and ignition, instantaneous local high temperature, the temperature can reach thousands of degrees, resulting in contact adhesion or oxidation, contact resistance gradually increases, and then fails; eventually it may lead to control failure, and even serious consequences, while the relay contact The specific reason for arc discharge ignition is that the contacts bounce continuously when they are pulled in, and the contacts are kept in contact and disconnected, thereby generating arc discharge spar...

AI Technical Summary

Problems solved by technology

[0002] Smart socket is an important part of smart home, but the lack of key components has a short life span and is prone to damage and failure. Among them, the failure of relay contacts is an important reason; the reason is that when the contacts are closed or disconnected, Instantaneous arc discharge and ignition, instantaneous local high temperature, the temperature can reach thousands of degrees, resulting in contact adhesion or oxidation, contact resistance gradually increases, and then fails; eventually it may lead to control failure, and even serious consequences, while the relay contact The specific reason for arc discharge ignition is that the contacts bounce continuously when they are pulled in, and the contacts are kept in contact and disconnected, thus generating arc discharge sparks, especially when the relay is closed at the peak of the alternating current, the arc discharge is the strongest at this time

When the contacts are disconnected, if the load is not purely resistive, a reverse electromotive force will be generated, and the air between the contacts will be broken down to form an arc discharge. The high temperature will burn the contacts and greatly reduce the life of the relay. The number of working times of the smart socket is much less than the average working life of the relay nominal

Images